Influence of wear state of forward disc cutter in Ignimbrite on its mechanical characteristics

Abstract

As the main rock-breaking tool, the disc cutter will directly affect the tunnelling efficiency of TBM. The research on the mechanical characteristics of cutter is the key to determine the TBM tunnelling parameters. The mechanical behaviour of disc cutter is still unclear at present, especially when taking wear state into consideration. Based on the above background, finite element method is used to study the rock-breaking characteristics of disc cutter under different working conditions, and the main research contents are: a numerical simulation model of disc cutter during rock-breaking was established by using ABAQUS. According to the characteristics of high compressive strength and high abrasiveness of the slightly weathered Ignimbrite in Fuzhou area, it is determined that the wear form of disc cutter in slightly weathered Ignimbrite is flat-edged wear. Based on this wear form, a study on the change rule of vertical, rolling and lateral forces, specific energy of rock breaking under different degrees of wear were carried on. Results indicate that vertical and rolling forces, specific energy of rock breaking generally increase with the degree of wear, reduce the tunneling efficiency of the disc cutter.